How do 802.1w and 802.1D handle BPDU?

• A.The 802.1W bridge does not forward BPDU packet.
• B.The 802.1D bridge only forwards BPDU packet received from the root bridge.
• C.The 802.1D bridge does not forward BPDU packet.
• D.The 802.1w bridge only forwards BPDU packet received from the root bridge.

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As shown in the figure, there are two IPv6 networks that can access the IPv4 network. At the same time, an IPSEC tunnel needs to be established between the two IPv6 networks for communication. Which of the following encapsulation modes can meet the requirements above?

• A.AH + tunnel mode
• B.ESP + tunnel mode
• C.AH + transmission mode
• D.None of the above options

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Which of the following statement about IPSG technology is correct?

• A.On the Huawei router, you can configure the IPSG function on the Vlanif.
• B.ip source check user-bind check-item command to configure based VLAN or interface IP packet checking items, the command have effect on the dynamic and static entries.
• C.The IPSG can perform binding table matching check on P packets that enter the interface and leave the interface.
• D.If an interface is configured as a DHCP snooping Trust HCP ACK, DHCP NAKHCP, and Offerf packets, other untrusted ports cannot receive these packets.

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Which of the following is the correct description of the process of registering the source DR with the RP in the PIM-SM?

• A.The registration message encapsulates the multicast service data.
• B.The RP sends a registration stop message as soon as it receives the registration message.
• C.The registration message is a multicast message.
• D.The registration message is used to construct an RPT tree between the source DR and the RP.

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You want to set the DSCP value of VoIP traffic in HW network equipment to EF.
According to the differentiated services model RFC, the flow mark EF should be set as _____.

• A.IP Experimental ECN
• B.IPTos is set to 0xEF
• C.Bitstream 101110
• D.DSCP is set to decimal 5
• E.DSCP is set to decimal 36

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